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Article
Ion transport controlled by nanoparticle-functionalized membranes
Physics Faculty Research
  • Edward Barry
  • Sean P. McBride, Marshall University
  • Heinrich M. Jaeger
  • Xiao-Min Lin
Document Type
Article
Publication Date
12-17-2014
Abstract
From proton exchange membranes in fuel cells to ion channels in biological membranes, the well-specified control of ionic interactions in confined geometries profoundly influences the transport and selectivity of porous materials. Here we outline a versatile new approach to control a membrane’s electrostatic interactions with ions by depositing ligand-coated nanoparticles around the pore entrances. Leveraging the flexibility and control by which ligated nanoparticles can be synthesized, we demonstrate how ligand terminal groups such as methyl, carboxyl and amine can be used to tune the membrane charge density and control ion transport. Further functionality, exploiting the ligands as binding sites, is demonstrated for sulfonate groups resulting in an enhancement of the membrane charge density. We then extend these results to smaller dimensions by systematically varying the underlying pore diameter. As a whole, these results outline a previously unexplored method for the nanoparticle functionalization of membranes using ligated nanoparticles to control ion transport.
Comments

The version of record is available from the publisher at http://dx.doi.org/10.1038/ncomms6847. Copyright © 2014 Macmillan Publishers Limited. All rights reserved.

Citation Information
Barry, E., McBride, S.P., Jaeger, H.M. and Lin, X.M., 2014. Ion transport controlled by nanoparticle-functionalized membranes. Nature communications, 5:5847.